Parental guidance - logic puzzle

In former days my father and mother, Abandoned me dead, lacking breath
Or life or being. Then one began, A kinswoman kind, to care for and love me;
Covered me with her clothing, wrapped me in her raiment, With the same affection she felt for her own;
Until by the law of my life's shaping, Under alien bosom I quickened with breath.
My foster mother fed me thereafter, Until I grew sturdy and strengthened for flight.
Then of her dear ones, of daughters and sons, She had the fewer for what she did.